Hello. I'm About 6 Weeks Pregnant. I've Had Some Brown

Hello. I'm about 6 weeks pregnant. I've had some Brown discharge twice now. It doesn't last very long each time. About a day and a half at most. A few hours at the least. It isn't very thick, and it's not constant. Only when I use the restroom and there hasn't been any fresh blood or spotting. It usually happens after intercourse. Is that normal? Or should I be worried? Thank you